Free wheeling dual wheel



Patented` Oct. 21, 1941 .Y

man WHEELING DUAL WHEEL Edward V. Garnett and Vactor G.; Garnett,

Denver, Colo.

Application May 27, 1940, -Serial No. 337,483

1i claims. (ci. 28o-96.3)

This invention relates to a d ual wheel construction for vehicles. This application isa companion to Serial No. 337,482,' led simultaneously herewith.

In the usual dual wheel con-struction, two Wheels with independent tires are locked together as an integral wheel unit, without any allowance for diierential movement between the wheels. Naturally, in rounding curves and in traveling on the'side of highly crowned pavements one of the dual Wheels endeavors to travel at a higher rate of speed than the other. Since the wheels are locked together as a unit, however,

they must rotate at the same speed and lany differential in travel distance is taken up in tire friction on the road.l As aresult the tires of dual wheels Wear away rapidly. 1

This objection to dual wheels has been recently recognized and attempts have been made to correct the trouble with use of differential gears and clutches between the wheels. Such constructions have been exceedingly heavy and exceedinglyexpensive and have introduced braking problems that have notas yet been satisfactorily j solved. If a brake is applied to one wheel vof a pair connected together differentially by gears the braking effect will be entirely neutralizedif the other wheel does.not have perfect traction and a differential movement'will be introduced in the wheels resulting in unusual tire wear. If ,the wheels are independent of each other and. the brake is applied to the inner wheel only, the braking eiect of the outer wheel is not only lost but the outer wheel tends to reduce the tractlve braking effect of the inner wheel.

The principal object of this invention is to pro-v vide a practical and eii'icient dual wheel construction in which the two wheels of the pair wil1- roll entirely 'independent ofeach other at all times and in which a single braking element will actv similarly and equally on both wheels 'of the vpair without introducing differential braking strains.- v

While the inventionis more particularly applicable to trailer. wheels, another object of the invention is to provide an independently movable dual wheel construction which can be lapplied to the front or steering dual wheels of a vehicle;

and in which a single set of b rake shoes will actv simultaneously against a braking drum on each:

of the wheels o f a' pair of dual wheels.

. Other objects of the invention are toprovide a device of this character,` which will allow easy access to either'wheel cfa pair or to either tire for repair or replacement purposes;' which will 55' The wheel disc I6 is formed with an annular allow easy access to the brake shoes and drums for replacements orrepirs; in which the loads of each wheel will be centralized over the bearings for that Wheel; and in which the load imposed by the steering pivotin the case of front or steering wheels, will be centralized between thetwo wheels to avoid allcantilever or bending stresses and equalize the road reactions' on the steering gear.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efllciency.

. These will become more apparent from the following description.

' In the following detailed description of the invention reference is had to the accompanying drawings which form a part hereof. Like nu.

merals refer to like parts in all views of the drawings and throughout the description. In the drawings:

- Fig. 1 is a vertical section through a pair of l dual wheels with the principles of the invention its steering pi of a pair of respectively. an the inner tire and rim are shown embodied therein. f Fig. 2 is a cross section taken on Fig. 1.

Fig. 3 is a detail plan View of the bearing box employed in the invention.

Fig. 4v is a vertical section through a pair of the line 2-2,

Fig. 5 is a cross sectionA through the alternate form, taken on the line 5-'5, Fig. 4 illustrating,

the braking mechanism.

Fig. 6 is a similar cross section, taken on the line 6 6, Fig. 4, illustrating construction.

In Figs. 2, 4, and 5 the pneumatic vehicle tires have .been omitted for clarity o'f illustration.

Referring to Figs. 1 and 2, a typical axle (more particularly lfnnt axle) is illustrated at I0 with the steering pivot ts at Il.' The outer tire and rim al wheels is shown at I2 .and I3,

at I4 and I5, respectively. v

vThe outerrim I3 is detachably secured to a wheel disc Ilwhich in turn is secured to a. flange I'I on the extremity of a stub shaft Il. The stub' shaft is jcurnalled in suitable bearings Isin a bearing box 20 which is pivotally mounted on the steering pivots. The stub shaft is secured against 4; A dual wheel mounting for vehicles comprising: a tubular, non-rotatable bearing member; an outer wheel; a stub axle lextending inwardly from said outer wheel into said bearing member and being journalled therein; an inner wheel positioned adjacent said iirst wheel and mounted for relative rotation therewith; a brake drum on each wheel adjacent each other; and brake shoe means for engaging both drums simultaneusly.

5. A dual wheel mounting for vehicles com prising; a tubular, non-'rotatable bearing member; an outer wheel; a stub axle extending inwardly from said outer wheel into said bearing member and being journalled therein; an inner wheel positioned adjacent said irst wheel and mounted for relative rotation therewith; a brake drum on each wheel adjacent each other; brake shoe means for engaging both drums simultaneously; and means for pivotally mounting said bearing member on an axle for steering purpses.

6. A dual wheel mounting for vehicles comprising: a tubular, non-rotatable bearing member; an outer wheel; a stub axle extending inwardly from -said outer wheel into said bearing member and being `icurnalled therein; an inner wheel rotatably mounted on the outer wheel soy that it may rotate relative thereto; an outer brake drum on said outer wheel; an inner brake drum on said inner wheel, said drums being of the same diameter and placedside by side to form a continuous'double braking surface; and internally expanding brake shoes contacting both drums simultaneously.

7. A dual wheel mounting for vehicles comprising: a tubular, non-rotatable bearing memt ber; an outer wheel; a stub axle extending inwardly from said outer wheel into said bearing member and being journalled therein; an inner wheel rotatably mounted on the outer wheel so 'that it may rotate relative thereto; an outer brake drum on said outer wheel; an inner brake drum on said inner wheel, said drums being of the same diameter and placed side by side to form a continuous double braking surface; internally expanding brake shoes contacting both drums simultaneously; and substantially vertical pivot means for securing said bearing member to the extremity of a vehicle axle. A

8. A dual wheel mounting for vehicles comprlsing: a tubular.' non-rotatable bearing member; an outer wheele: stib aoexszednding inwai-diy from said ou w eel bearing member and being joumalled therein; an inner wheel rotatably mounted on the outer wheel so that it may rotate relative thereto: an outer brake drum on said outer wheel; an inner brake drum on said inner wheel, said drums being of the same diameter and placed side by side to form a continuous double braking surface; internallyv expanding brake shoes contacting both drums simultaneously; and a brake supporting member for supporting said brake shoes. said latter member being fixedly mounted on said bearing member. l

9. A dual wheel mounting for vehicles comprising: a non-rotatable, tubular bearing' member; an outer wheel; a stub shaftl fixed to said outer wheel and extending axially within one extremity of said tubular member; bearings for vsaid stub shaft within said member; an inner wheel positioned alongside said outer wheel; and bearings rotatably mounting said second Wheel on the exterior of said tubular member so that said wheels may rotate independently. 4

10. A dual wheel mounting for vehicles.y comprising: a non-rotatable, tubular bearing member; an outerwheel; a stub shaft iixed tosaid outer wheel and extending axially within one extremity of said tubular member; bearings for said stub shaft within said member; an inner wheel positioned alongside said outer wheel; bearings rotatably mounting said second wheel on the exterior of said tubular member so that said wheels may rotate independently; a cylindrical braking drum on the adjacent face of each wheel, said drums being of the same diameter and positioned side by side; and brake shoe means over-lapping the braking surface of both drums to exert a retarding action on both simultaneously.

11. A dual wheel mountingfor vehicles comprising: a non-rotatable, tubular bearing member; an' outer wheel; a stub shaft xed to said outer wheel and extending axially within one extremity of said tubular member; bearings for said stub shaft with said member; an inner wheel positioned alongside said outer wheel; a sleeve l on said inner wheel surrounding and liournalled on said tubular bearing member rotatably supportingsaid inner wheel so that the two wheels may rotate independently; an outer housing surrounding said sleeve and iixed to the other extl'emity of said tubular bearing member: and

means for 'pivotally mounting said outer housing in a bifurcated axle extremity for steering pur- EDWARD V. GARNETT.' VACTOR G. GARNETT.

Oct. 21, 1941. J. A. GREEN ETAL MINNow 0R LIVE BAIT BUCKET Fiied July 27, 1940 Wiliam 1MM/ /9 fmes .if ra 

